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Android app suddenly stopped showing ads
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I had published an app 5~6 months ago and integrated AdMob in it. It was working fine till October 10 when the impressions dropped to below 100 . 
I used to get 40~50K impressions daily. There was a warning to add app-ads.txt which I added after I saw drop in impressions on October 10.  
I have attached the insights graph which shows drop in impressions and Admob network performance (showing yesterdays performance). I have not changed anything in the implementation. 
You can see the match rate has dropped significantly  but Requests haven’t dropped. It hasn’t been resolved till now and I have no idea what the cause is. I added app-ads.txt and it shows “100% of your app-ads.txt queries authorized” but it hasn’t fixed the issue, please advice. 
Edit: There are also no warnings or policy violations in the policy center
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I tried integrating rewarded ad units. I am not sure what went wrong as ads were working earlier. It suddenly stopped and started returning error:- 
Request Error: No ad to show.

After further investigation I got to know that I also need to specify mediation group. I added one but now I am getting the following error:-
Error Domain=com.google.admob Code=8 "Cannot find an ad network adapter with the name(s): com.google.DummyAdapter. Remember to link all required ad network adapters and SDKs, and set -ObjC in the 'Other Linker Flags' setting of your build target." UserInfo={NSLocalizedDescription=Cannot find an ad network adapter with the name(s): com.google.DummyAdapter. Remember to link all required ad network adapters and SDKs, and set -ObjC in the 'Other Linker Flags' setting of your build target., gad_response_info=  ** Response Info **
    Response ID: _EttYYG_HIuxyAPompnoDw
    Network: (null)

  ** Mediation line items **
    Entry (1)
    Network: com.google.DummyAdapter
    Credentials:
{
}
Test ads are working fine.
I am not sure on how to fix this issue. Please help me to resolve the above as my iOS app is already live. The issue is affecting many live users.
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